Recommended Wiring
Practices
Input Power Wiring
Power specs!
• Input Power 20-28vac"
• Consumption 15VA with
No external loads"
By connecting pin 40 to earth
ground pins 4, 6, 9, 12, 15 &18 are
also connected to earth ground. "
24 VAC
Primary
Secondary
Wires
Wires
Earth Ground
Communication Wiring
From previous controller"
To next controller"
Using FTT-10A Free-Topology Transceiver!
• 500 meters, 1640 feet, maximum cable length"
• 400 meters, 1312 feet, maximum node-to-node
distance"
Use only approved wiring!
• Use Level 4 cable (22 AWG), Twisted Pair"
• FTT-10A is Polarity insensitive"
Approved Communication Wiring
Taco
Wire Description (Level 4)
Part # WIR-022; 1000 ft. spool
22AWG, Unshielded, Plenum rated, twisted pair
Proper Sensor Wiring
10k Precon Type
III Thermistor
Shield wire
cut and
taped to
wire jacket
Note 1
Earth Ground
Shield wire
connected to
Earth Ground
Notes
1.
Stranded Twisted Shielded Pair,
14 – 22 AWG; 18 AWG
recommended
Approved Sensor Wiring
Taco
Wire Description (18AWG)
Part # WIR-018; 1000 ft. spool
Shielded, Plenum rated, 18AWG stranded twisted shielded pair
Proper Controller Grounding
10k Precon Type
III Thermistor
Shield wire
cut and
taped to
wire jacket
Note 1
Earth Ground
Shield wire
connected to
Earth Ground
24 VAC
Secondary
Wires
Notes
1.
Stranded Twisted Shielded Pair,
14 – 22 AWG; 18 AWG
recommended
Earth Ground
Primary
Wires
DXU-3 Power Isolated Example
DXU3 Power Sourcing Example
DXU3 Power Sinking Example
Typical wiring for a Split System, 1 stage heating/cooling, using a DXU-3
Use only Echelon approved cable
From previous controller"
Terminal block
located in unit
To next controller"
HUM
COM/24V
W
Y
Stranded Twisted Shielded Pair, 14 – 22
AWG; 18 AWG recommended
G
Wiring to
condensing
unit
10k Precon Type
III Thermistor
Shield wire
cut and
taped to
wire jacket
R
24 VAC
Primary
Secondary
Wires
Wires
Earth Ground
Shield wire
connected to
Earth Ground
Earth Ground
Controller switch configurations
Triac Outputs
•
•
•
•
Rated at 1 amp
Must wire switching 24 AC voltage to TCxx Terminal
Outputs are paired together so they share a TCxx
TCxx’s are not tied together
Environmental ratings
•  Temperature: 14 F to 140 F (-10 C to 60 C)
•  Humidity: 0 to 95 percent, non-condensing
Agency Listings and Compliances
•  UL 916 for the US and Canada
•  FCC Part 15 Class A